IEEE Power & Energy Magazine - May/June 2019 - 91

✔ low power losses during normal operation, resulting

from use of fewer power semiconductor devices in the
main branch (six FBSms form a 2 × 3 matrix, cooling
system, and power adapter)
✔ use of a lightweight contact system (six Vis in series;
40.5 kV because each uFD separates without experiencing current)
✔ modular design (four modular units, 50 kV each; 36
FBSms in each unit), which facilitates maintenance
and replacement of parts
✔ high reliability resulting from exposure to lower voltages due to a series design that distributes voltages
during switching.
Because no relevant international electrotechnical commission (iec) standards currently exist, conformance tests

had to be performed to verify the hVdc cB design. these
were developed based on the operating principles and conditions of the hVdc breaker as well as the present iec standard for testing VSc hVdc valves. the test was divided into
two parts: the insulation test and the operating test.
the insulation test verifies the voltage-withstanding capacity and the voltage-sharing characteristic of an hVdc cB. the
operating test checks the capacity of each core component to
withstand serious stress and the operational properties under
different circumstances. table 1 shows some of the main testing considerations.
the 200-kV hybrid dc cB passed the test in which a
15-ka short circuit current was cleared within 3 ms and the
transient interruption voltage across the test object exceeded 320 kV.

Auxiliary Branch
iT1
Ultrafast
Disconnector

Auxiliary
Branch

FBSM
Main Branch

iT2
FBSM FBSM
Modular Unit

FBSM FBSM
Modular Unit

FBSM FBSM
Modular Unit

FBSM FBSM
Modular Unit

Energy
Absorber

Main
Branch

iabsorb
Energy Absorber
uDB
(a)

(b)

figure 7. (a) The topology and (b) a prototype of a 200-kV hybrid HVdc CB.
table 1. Factors related to testing the insulation and operating characteristics of HVdc CBs.
Number

Test

Test Object

Items

Objective

1

Insulation test

Phases to ground

DC voltage withstand test

To verify the voltage-withstanding
capacity and partial-discharge level of
support structure

2

Switching impulse withstand test

3

Lightning impulse withstand test

4
5
6

Operating test

Across open
contacts

DC voltage withstand test

Key components

Peak withstand current test

Switching impulse withstand test

7

Overload withstand current test

8

Short-time withstand current test

9
10

To verify the current-withstanding
capacitor of the CB

Short-time withstand current test
Overall prototype

Rated current-interruption test

11

Short circuit current-interruption test

12

Rated current-making test

13

Short circuit-making test

may/june 2019

To verify the voltage-withstanding
capacity across open contacts

To verify the current-interruption
capacity and interruption time
of the overall prototype and the
program correctness of the control
and protection system

ieee power & energy magazine

91



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
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IEEE Power & Energy Magazine - May/June 2019 - Cover3
IEEE Power & Energy Magazine - May/June 2019 - Cover4
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